.Tetris{
    width: 100%;
    height: 100%;
}

tr{
    height: 35px;
}
td{
    width: 35px;
    border-top: 1px solid #e9ebee;
    border-left: 1px solid #e9ebee;
}
tr td:last-of-type{
    border-right: 1px solid #e9ebee;
}
tr:last-of-type td{
    border-bottom: 1px solid #e9ebee;
}